We've decided the right option is to not do VAT on domestic flights, not to have some sort of air-miles allowance and instead to tax the pollution that planes cause. That is very sensible approach. And every penny, this is vital, every penny, of any new green tax will go back to families in a family tax cut.

This translates as: we will tax planes that are flying empty between London and Manchester, whilst we won't tax planes that are flying full from London to Milan.

As for green taxes going into a "family fund" for future tax cuts, wouldn't it be better to take all the monies raised from green taxes and put them towards green improvements? Taxing cars, so that we can invest in public transport, so people don't have to use cars as much? Taxing cars, so that we can invest in cycling infrastructure/rent-a-bike programmes, so people don't have to use cars as much? Oh no, Cameron has to blow the dog whistle to Tory voters out in the heartland, I'm really a tax cutter at heart, not a loony greenie.